Patent GB-226777-A (GB)
Title: Improvements relating to refrigerating machines
IPC: F25B1/04
Filed: 1924-10-13
Abstract: 226,777. Kucher, A. A. Dec. 28, 1923, [Convention date]. Refrigerating, compression machines for; icemaking, can or mould apparatus for.-A compact machine adapted to be installed in a domesticrefrigerator comprises an evaporation chamber 10 arranged around a condensing chamber 15, which surrounds a rotary compressor 40 and an electric driving motor 44. The evaporating and condensing chambers are preferably separated by an insulating chamber 18, which may be maintained under vacuum by connection to the suction of the compressor. The top of the machine may be formed as an ice-making compartment 76 containing ice-moulds 77. The walls 11, 13, 16 of the evaporating, vacuum and condensing chainbers respectively are united as by welding to a ring 19 at the base, and the top wall 12 of the evaporating chamber is provided with radial fins 81 projecting downwardly into the refrigerant, which is normally above the level of the top 14 of the vacuum chamber. The top is fitted with a removable insulated cover 75, so that when the machine is not required for making ice the whole of the walls of the evaporator after removal of the cover 75, may be exposed to the air of the refrigerating-chamber. A cylindrical structure 36 containing the motor and compressor is secured within the outer chambers by studs 42 screwing into the ring 19. The condensing-chambe.r is cooled by coils 21 connected through fittings 23 in the base of the structure 36 with external flexible pipes 24. The structure 36 is provided with feet or skids 43 apertured to permit circulation of air beneath the machine. Preferably a homogeneous mixture of refrigerant and lubricant is employed as the working fluid, as described in Specification 208,547. The compressed mixture is discharged by the compressor through a port 55 and pipe 56 against the top 17 of the condensing-chamber, which is so shaped to deflect liquid downwards into the well 39. Owing to the heat of the compressor and motor the refrigerant is evaporated, leaving liquid lubricant in a well 39, and this liquid is fed through a pipe 57 to the upper bearing 54 of the shaft of the compressor. The motor shaft 47 is made hollow to serve as a passage for lubricant, and is keyed to the compressor shaft to permit of axial adjustment or separation of the motor and compressor. The oil flows through the compressor and down the shaft 49 until it meets the end of the motor shaft 47, whence it is thrown outwards into a cup 60 communicating through a passage 61 with the interior of the motor shaft. It collects in a pan 62 below the bottom bearing, and flows back into the evaporating-chamber through a passage 64 and a pipe 65. This pipe 65 passes through the interior of a pipe 66, through which vapour is drawn into the compressor suction passage 67, and the oil overflows into the suction pipe so as to be drawn into the compressor. An opening 69 in the pipe 66 serves to admit liquid refrigerant with the vapour into the suction passage. The vacuum chamber is connected through a pipe 70 with the upper part of the evaporator, so as to be continuously exhausted by the compressor. The condensed refrigerant passes through a valve 27 controlled by a float 33 to a perforated pipe 31 at the bottom of the evaporator. Specifications 6724/15, 187,604, 195,943 and 217,178 also are referred to.